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[Scaler <1451613@xxxxxxxxxxxxxxxxxx>]

I did some other tests with mouse and touchpad, when locking screen:
- if I use mouse click or click with button near touchpad → chrash
- if I use *tap* on touchpad or key shortcut CTRL+ALT+L (unlike what I said in my first report) → no crash

and I managed to produce a backtrace \o/ (that wasn't easy ^^").
See attached file.

** Attachment added: "compiz backtrace"
   https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1451613/+attachment/4405055/+files/gdb-compiz.txt

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https://bugs.launchpad.net/bugs/1451613

Title:
  Unity/compiz crashes when locking screen

Status in Unity:
  New
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  Since a recent update (around April 29th), sometimes (approximately once a day) when I lock my computer screen (CTRL+L or using system menu) the computer freeze for a while (2 to 30 seconds) before showing the login screen.
  Then when I try to unlock the screen I need to enter my password twice (with no error message after the first try).
  Once logged in, all applications are closed. Uptime is still running (since no reboot) and services too (with no interruption).

  Looking at the apport.log file (see attached) it seems that when I try
  to lock the screen, compiz crashes.

  I've attached the compiz crash file too (_usr_bin_compiz.1000.crash)
  but without the 100Mo data of base64 core dumb…

  
  I'm using Ubuntu 14.04 AMD64.
  Graphics drivers: nvidia-331.113 (tested)

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